Radial Lip Seals

8/9/2019 Radial Lip Seals

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Walkersele® Radial Lip Seals

High Performance Sealing Technology

●

High-efficiency lip seals forrotary duties● Proven long-term bearing

protection● Many standard sizes ex-stock ● Unlimited diameters to order● Custom-designed specials● Also V-ring and metal cased

lip seals

Issue 43.1


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Main Page or Subject Heading

To order or get further details, call your local contact shown on rear cover or listed at www.jameswalker.biz2

Introduction


James Walker & Co is a member of the James Walker Group, a

dynamic global manufacturing organisation that supplies a vast

range of specialised products and services to virtually every

industrial sector.

We have more than 50 production, engineering, distribution

and customer support facilities worldwide — backed by

extensive IT networks, e-commerce systems and logistics

operations — to serve customers in over 100 countries.

Two of our world-leading areas of expertise are high

performance fluid sealing and bolting technology. These

are mainly materials-led, and range from research,development and manufacture to product application and

plant refurbishment. Together with associated knowledge

based services, they help to keep industry running safely and

efficiently, year after year.

Contents

P3. Why you fit Walkersele®

Walkersele® selectionP4. Simple steps to Walkersele selectionP4. Performance table 1: Maximum working pressureP5. Performance table 2: Walkerseles for use with

retaining platesP5. Performance table 3: Self-retaining Walkerseles

P6. Walkersele® profile & material combinations

Walkersele® standard materialsP7. M1 — nitrile (NBR)P7. M5 — butyl (IIR)P7. M6 — nitrile (NBR)P8. M8 — fluoroelastomer (FKM)P8. M9 — fluoroelastomer (FKM)P8. Elast-O-Lion® 180 & EOL/KC300 —

hydrogenated nitrile (HNBR)P8. FR66/80 & FR66/KC300 — fluoroelastomer (FKM) for

electrical insulation duties

P8. Fluolion® (PTFE)

Walkersele® high-performance materialsP9. Ultraglide — reformulated hydrogenated nitrile (HNBR)P9. Aflas® — tetrafluoroethylene/propylene (FEPM)

Walkersele® designsP10. Walkersele® D6 — our most popular designP11. Walkersele® D7 — pressure resistant lip sealP11. Walkersele® D1 — original designP12. Walkersele® D5 — compact designP12. Walkersele® D4 — slow rotary dutiesP12. Walkersele® TBMS — tunnel boring machine sealP13. Customised designs

P14-15. Walkersele® OSJ-2 for On-Site Joining

Special arrangements for worn shaftsP16. Walkersele® CartridgesP16. Spacer ringsP16. Walkersele® Shaft Sleeves

Special featuresP17. Walkersele® SpringSafeP17. Walkersele® SpringCoverP17. Walkersele® with Dust LipP18. Walkersele® Shallowback designsP18. Walkersele® Long LipP18. Walkersele® with ports & groovesP19. Endless-type WalkerselesP19. Split-type Walkerseles Standard rangesP20. Walkersele® M1/D6P20. JW Chart 56: M1/D6 — inch sizes

P21. JW Chart 57: M1/D6 — metric sizesP22. Walkersele® M6/D6P22. JW Chart 104: M6/D6 — inch sizesP23. JW Chart 105: M6/D6 — metric sizesP23/24. JW Chart 376: M6/D6 — to DIN3760/(BS) ISO 6194-1

Walkersele® housingsP25. Housing sizes — Walkersele® D6 designP25. Housing sizes — Walkersele® D7 designP26. Housing tolerances — D6 & D7 designsP26. Housing chamfers — D6 & D7 designsP26. Shaft chamfers — D6 & D7 designsP26. Retaining plate dimensions — D6 & D7 designs

Walkersele® installation techniques

P27. General informationP27. Endless seals (except M6 & M8)P27. Endless seals M6 & M8 self-retainingP27. Split seals (not applicable to M6 & M8)P28. Fitting self-retaining lip seals in blind housing

(closed recess)P28. Walkersele® OSJ-2 On-Site Joining

Operational considerations P29. Multi-seal configurationsP29. Seal lubricationP30. Eccentricity limitsP30. Lip support platesP30. Shaft surfacesP31. Shaft hardnessP31. Ceramic shaftsP31. Housing surfacesP31. Walkersele® storageP31. Walkersele® power consumption

Other rotary sealsP32. End face seals or V-ringsP32. Metal cased lip seals

James Walker in actionP33. Customer support at every levelP33. Worldwide network and supplyP33. Production facilitiesP34. Quality standards

P34. Research & developmentP35. Industry-wide applicationsP35. Trademark acknowledgementsP35. General informationP36. Contacts


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Why you fit Walkersele®

3To order or get further details, call your local contact shown on rear cover or listed at www.jameswalker.biz 3

Worldwide reputation

Walkersele® is our well proven family of radial lip seals for

rotating shafts and rotary plant such as gearboxes, rolling mills,

marine propulsion systems, process mixers and kilns.

Industry worldwide relies on Walkersele to:• Protect bearings

• Prevent ingress of water and other media

• Keep lubricants contamination-free• Prevent oil and grease spoiling finished products.

Moreover, design engineers and plant operators rely on our

pedigree in high performance fluid sealing technology and full

technical back-up to provide the best value solution to their

specific sealing problems.

Constant development & innovation

When our many standard designs cannot solve a particular

problem, we can custom design and manufacture a special

lip seal that will. We use state-of-the-art finite element analysis

(FEA) techniques to fine tune the design parameters before

prototyping and running the product on our in-house test rigs.

Constant research and development over the past 50 years has

produced numerous improvements in materials and design.

These ensure Walkersele® can operate efficiently for extended

periods in hot and abrasive industrial environments and below

the surface on marine vessels of every size.

Special innovative features such as our patented Walkersele

OSJ-2 on-site joining technique, SpringSafe positive spring

retention system, and Cartridge Walkersele, all provide top

level sealing integrity with peace-of-mind plus easier and swifter

installation for reduced plant downtime.

Better efficiency — lower running costs

The main job of Walkersele® is to retain lubricant within a

bearing assembly. It will effectively

• Extend bearing life and improve plant reliability.• Cut maintenance costs and downtime.• Reduce lubricant loss and costs.

• Cut power consumption with low-friction running.

• Reduce corrosion caused by dissimilar metal interfaces.

When manufactured with a secondary lip a Walkersele will also

prevent the ingress of solid or liquid contaminants. Back-to-

back configurations within a housing are particularly effective at

the interface of two separate fluids, such as oil and water.

Flexible manufacturing & stockholding

We have thousands of mould tools for Walkersele® production,

for virtually all shafts of metric and inch standard sizes, plus

hundreds of non-standards. The list grows constantly.

Large volumes of Walkersele in popular types and sizes arestocked for same day despatch. We also provide an express

manufacturing service to meet industry’s most urgent demands.

Our Materials Technology Centre houses one of Europe’s largest

elastomer moulding presses for making seals up to 2.2m OD

(87 inch) in a single pass. But this does not limit the size of a

Walkersele as we mould to unlimited diameters using a special

technique — our current record stands at 11m (36 ft) diameter!

Overcoming the Gough-Joule Effect

When an elastomer in tension is heated, the tension within the

rubber increases — a phenomenon known as the Gough-Joule

Effect. Thus, if an elastomeric radial seal in tension is subjected

to frictional heat, it tightens on the shaft to generate higher

friction, wear and more heat, reducing the seal’s working life.

Standard M1, M5 and M9 Walkerseles overcome this effect by

having an interference fit within the housing bore. This puts the

elastomer into compression, rather than tension, to avoid the

vicious cycle of frictional heat followed by increased tensionand wear.


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Walkersele® selection


Step 3: Seal retention methodDetermine whether the seal will be Retained in its housing by abolted plate, or Self-retaining in an open housing.

Step 4: Performance tablesFor Retained seals refer to Performance Table 2 on page 5.For Self-retaining seals refer to Performance Table 3 onpage 5. Cross reference your suggested Walkersele Design/s (from Step 1), maximum working temperature, and surfacespeed to find the Walkersele type/s that most closely matchyour requirements.

Step 5: Material compatibilityCheck that the seal material/s (M1, Ultraglide K, etc) arecompatible with your fluid media by referring to WalkerseleMaterials on pages 7-9. If in doubt, please consult ourTechnical Support Team.

Step 6: Walkersele operational featuresPlease consider and check the availability of the followingoptions for your combinations of Walkersele Material/Design: a) Split or Endless type seals. Endless types give top sealingintegrity and can be used in an open housing. Split types areeasier and swifter to install during plant maintenance, as thegland/shaft assembly rarely needs to be stripped down to gainaccess. However, abutting the seal ends is NOT recommendedwhen shaft dynamics are severe, where the sealed fluid isunder pressure or flooded conditions, or if sealing integrityis a prime consideration — therefore please considerWalkersele OSJ-2. Note that Walkersele D7 design issupplied only as an endless type or OSJ-2.

b) Walkersele OSJ-2 for On-Site Joining of split type seals forcost-effective maintenance and greatly reduced downtime(see pages 14-15).c) Walkersele SpringSafe: to keep the lip-energising springsecurely in position during installation and operation (page 17).d) Walkersele with Ports & Grooves: to distribute lubricant tothe lips of seals working in back-to-back formation (page 18).

e) Walkersele SpringCover: providing external and internalcorrosion protection for lip-energising springs (page 17).f) Walkersele with Dust Lip: (eg, Walkersele D6/DL): ‘standard’designs with an auxiliary dust lip incorporated to prevent theingress of contaminants in aggressive environments (page 17).g) Walkersele Shallowback: Walkersele D6 and D7 designswith reduced depth at the back and flexible, extended lips, foruse where housing depth is limited (page 18).h) Walkersele Long Lip: for sealing slow rotary shafts thatsuffer a high degree of eccentricity (page 18).

Step 7: Ordering your WalkerselePlease check the size of Walkersele you need against ourStandard Ranges (pages 20-24) then call to your local James

Walker contact for advice on product suitability and delivery.If the seal you want is not listed, please refer to your JamesWalker contact, as we have thousands of Walkersele mouldsincluding a vast number of non-standard sizes.

Simple steps to Walkersele® selection

Walkersele® radial lip seals are identified by their Materials ofconstruction (M1, Ultraglide K, etc) and Design (D6, D7, etc).Typical designations are Walkersele M1/D7, and WalkerseleUltraglide K/D6.

To select the correct Walkersele for your application, pleaseconsider your operational parameters in the order outlined below.

Step 1: Maximum working pressureMaximum working pressure is the primary parameter usedto determine the most suitable Walkersele Design for yourapplication. Please refer to Performance Table 1, below.

PERFORMANCE TABLE 1

Maximum workingpressure

Walkersele® Designrecommendations

≤0.2bar (2.9psi) D6 & D6/DL

0.2bar (2.9psi) to 2.0bar (29psi)

D6 with lip support plate

OR

0.2bar (2.9psi) to

4.0bar (58psi)D7

>4.0bar (58psi)Special D7 configurations: pleaseconsult our Technical Support Team

We recommend you use our Walkersele D6, D6/DL or D7designs wherever possible. Between them, they cover thevast majority of radial lip seal applications across the industrialspectrum — including marine duties.

If these designs are unsuitable, please consider ouralternatives, such as D1, D4, D5, TBMS or a specialcustomised-design seal. For details of these, please refer topages 11-13.

Where the choice is between D6 with a lip support plateand our D7 design, for pressures above 0.2bar (2.9psi), wenormally recommend the well proven D7 as its robust profileis specially developed for pressure applications. If, however,low lip loading and lip flexibility are major considerations, thena D6 with a lip support plate should be considered for dutiesbetween 0.2bar (2.9psi) and 2.0bar (29psi). Please consult ourTechnical Support Team for all duties above 4bar (58psi).

Step 2: Operational parametersDetermine the following for your specific application:a) Maximum under-lip working temperature of seal. Note thatunder-lip temperature can often be substantially higher (eg, by

30°C or 54°F) than the fluid media temperature.b) Maximum shaft surface speed. (Note: With D7, maximum

pressure and velocity ratings may not necessarily be applied simultaneously — please consult our Technical Support Team).c) Fluid media to be retained by the seal.


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Walkersele® selection


PERFORMANCE TABLE 2: Walkerseles for use with retaining plates

Walkersele® type MaterialMaximum under-lip temperature

Maximum constantsurface speed

Comments

M1/D6 Nitrile (NBR) 120°C (248°F) 15m/s (2953fpm) Most popular Walkersele for general duties

M1/D6/DL Nitrile (NBR) 120°C (248°F) 15m/s (2953fpm) M1/D6 with additional dust lip

M1/D7 Nitrile (NBR) 120°C (248°F) 12m/s (2362fpm) Popular seal with pressure resistant lip

M5/D6 Butyl (IIR) 120°C (248°F) 5m/s (984fpm) Used for its specific chemical compatibilities

M5/D6/DL Butyl (IIR) 120°C (248°F) 5m/s (984fpm) M5/D6 with additional dust lip

M5/D7 Butyl (IIR) 120°C (248°F) 5m/s (984fpm) Used for its specific chemical compatibilities

Elast-O-Lion® 180 &Elast-O-Lion/ KC300/D6

Hydrogenated nitrile(HNBR)

150°C (302°F) 15m/s (2953fpm)For duties in hot, aggressive & abrasiveconditions

Elast-O-Lion® 180 &Elast-O-Lion/ KC300/D7


150°C (302°F) 12m/s (2362fpm)With pressure resistant lip, suitable for duties inhot, aggressive & abrasive conditions

M9/D6Fluoroelastomer(FKM)

200°C (392°F) 25m/s (4922fpm)For high temperatures and speeds wherechemical compatibility is important

M9/D6/DLFluoroelastomer(FKM)

200°C (392°F) 25m/s (4922fpm) M9/D6 with additional dust lip


200°C (392°F) 22m/s (4331fpm)With pressure resistant lip, suitable for hightemperatures, high speeds & chemicals

Ultraglide K/D6 Reformulated HNBR 150°C (302°F) 30m/s (5906fpm)Optimised for greatly extended working lifeunder hot & abrasive conditions

Ultraglide K/D7 Reformulated HNBR 150°C (302°F) 25m/s (4922fpm)Seal with pressure resistant lip; offers greatlyextended working life in hot & abrasiveconditions

FR66/80 & FR66/KC300/ D6

Fluoroelastomer(FKM), with non-carbonmineral fillers.

200°C (392°F) 25m/s (4922fpm)Seal for bearings where a high level of electricalinsulation is required

TBMS Nitrile (NBR) 120°C (248°F) 2m/s (394fpm)Tunnel boring machine seal for harshunderground environments

PERFORMANCE TABLE 3: Self-retaining Walkerseles

Walkersele® type MaterialMaximum under-lip temperature

Maximum constantsurface speed

Comments

M6/D6 Nitrile (NBR) 120°C (248°F) 12m/s (2362fpm) Most popular self-retaining Walkersele

M6/D6/DL Nitrile (NBR) 120°C (248°F) 12m/s (2362fpm) M6/D6 with additional dust lip

M6/D7 Nitrile (NBR) 120°C (248°F) 10m/s (1969fpm) Popular seal with pressure resistant lip

Elast-O-Lion® 180/D6/M


150°C (302°F) 15m/s (2953fpm)For duties in hot, aggressive and abrasiveconditions

Elast-O-Lion® 180/D6/DL/M


150°C (302°F) 15m/s (2953fpm) Elast-O-Lion® 180/D6/M with additional dust lip

Elast-O-Lion® 180/D7/M


150°C (302°F) 12m/s (2362fpm)With pressure resistant lip, suitable for duties inhot, aggressive and abrasive conditions


200°C (392°F) 20m/s (3937fpm)For high temperatures and speeds wherechemical compatibility is important

M8/D6/DLFluoroelastomer(FKM)

200°C (392°F) 20m/s (3937fpm) M8/D6 with additional dust lip

M8/D7 Fluoroelastomer(FKM) 200°C (392°F) 18m/s (3543fpm) With pressure resistant lip, suitable for hightemperatures, high speeds and chemicals

Ultraglide D6/M Reformulated HNBR 150°C (302°F) 15m/s (2953fpm)Optimised for greatly extended working life underhot and abrasive conditions

Ultraglide D7/M Reformulated HNBR 150°C (302°F) 15m/s (2953fpm)Seal with pressure resistant lip; offering greatlyextended working life


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Walkersele® profile & material combinations

Walkersele® profiles in M1, M5, M9, Elast-O-Lion® or Ultraglide materials

D1 D1/DL D5 Internal D5 External D6 D6/DL

D6 External D7

D1 D1/DL D5 Internal D6 D6/DL D7

Walkersele® profiles in M6, Elast-O-Lion® or Ultraglide materials with 'M' backs

D1 D1/DL D5 Internal D6 D6/DL D7

Walkersele® profiles in M6, M8, Elast-O-Lion® or Ultraglide materials with ‘S’ backs

TBMS

Other Walkersele® profiles available

D4 Internal Long LipShallowback


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Walkersele® standard materials


It is essential that the materials used in the manufacture of yourWalkersele® are:• Chemically compatible with the media to be sealed.• Stable at the required working temperature. Note that the

seal’s ‘under-lip’ temperature can be substantially higher— by 30°C (54°F) or more — than that of the fluid beingcontained.

• Wear resistant at the operating conditions.• Suitable for your operating speed.

Standard & high performance materialsThe nine elastomer-based material grades listed on this and the

following two pages have been specially developed by JamesWalker Technology Centre for radial lip seal duties.

We compound all the elastomers in-house on a state-of-the-art internal mixer to an exacting quality regime with totaltraceability. Each batch of compound is subjected to rigoroustesting and statistical process control before being convertedto the final product.

Customised materialsWhen our standard materials are unsuitable, we will tailor acompound to meet your specific operational requirements,typically for:• Higher or lower temperature duties.• Additional ozone resistance.• Additional abrasion resistance.• Eco-friendly fluid compatibility.• Lower power consumption.

Technical adviceIf you have any special material requirements, or want adviceon materials selection, please contact our Technical SupportTeam.

M1 — nitrile (NBR)

The most popular material for the majority of Walkerseleapplications. Suits housings fitted with retaining plates.

Media compatibility: Suitable for use with water and themajority of oils and greases.

Seal construction: Flexible back of nitrile-proofed cottonfabric; lip of 80 IRHD nitrile.

Maximum under-lip temperature: 120°C (248°F) constant.

Maximum surface speed: 15m/s (2953fpm) with D6 design.12m/s (2362fpm) with D7 design.

M5 — butyl (IIR)

Often specified for use with media where butyl is required forchemical compatibility. Suits housings fitted with retaining plates.

Media compatibility: Resistant to silicone oils and greases,ozone, hot and cold water, acids, alkalis, salt solutions,alcohols, and glycols. Must NOT be used with mineral-basedoils or greases.

Seal construction: Flexible back of butyl-proofed cotton fabric;lip of 70 IRHD butyl.


Maximum surface speed: 5m/s (984fpm) with both D6 and D7designs.

M6 — nitrile (NBR)

Our most popular material for self-retaining seals used in openhousings.

Media compatibility: Suitable for use with water and themajority of oils and greases.

Seal construction: Nitrile, with a steel band encapsulated in itsback.



Walkersele® success

Side thrusters & stabilisers

Cunard Line’s new 90,000 tonnecruise ship MSQueen Victoria, hasWalkerseles fitted

as OEM equipmentto protect its

stabilisers and sidethrusters.

Built at Fincantieri’s shipyard in Venice-Marghera, andcruising since December 2007, it is Cunard’s secondlargest ever ship after the Queen Mary 2 — and the firstfrom an Italian yard.

Photo by courtesy of Fincantieri SpA


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Walkersele® standard materials

M8 — fluoroelastomer (FKM)

High working temperature material for self-retaining seals inopen housings.

Media compatibility: Excellent resistance to all lubricating oils,fuels, air, water and dilute acids.

Seal construction: Moulded in fluoroelastomer with steel bandlocated in its back.



M9 — fluoroelastomer (FKM)

For high working temperatures, or where fluoroelastomer isneeded to accommodate high operating speed or chemicalcompatibility. Suits housings fitted with retaining plates.


Seal construction: Flexible back of fluoroelastomer-proofedaramid/glass fabric; lip of fluoroelastomer.



Elast-O-Lion® 180 & EOL/KC300 —hydrogenated nitrile (HNBR)

High strength Elast-O-Lion® HNBR elastomer, suitable foraggressive and abrasive applications, where it providesincreased wear resistance.

Media compatibility: Excellent resistance to all lubricating oils,fuels, air, hot and cold water, dilute acids and alkalis.

Seal construction: Flexible back of Elast-O-Lion proofedaramid/glass fabric; lip of Elast-O-Lion.

Maximum under-lip temperatures: 150°C (302°F) constant; or170°C (338°F) constant in oil.


FR66/80 & FR66/KC300 —fluoroelastomer (FKM) for electricalinsulation duties

Special-duty fluoroelastomer-based materials. They are greenin colour and suit housings fitted with retaining plates.

Special applications: These materials are suitable for fluidsealing duties where a high level of electrical insulation isrequired. They contain a non-carbon mineral filler system thathas an extremely high electrical resistance.


Seal construction: Flexible back of FR66 fluorocarbon-proofedaramid/glass fabric; lip of FR66/80 fluoroelastomer.


Maximum surface speed: 25m/s (4922fpm) with D6 design.

Resistivity: >3x1013 ohm.cm at 500V dc (BS903 Pt C2).

Fluolion® — PTFE

Fluolion® is James Walker’s trade name for its range ofpolytetrafluoroethylene (PTFE) materials and products.

Applications: In virgin form PTFE has exceptional chemicalinertness, hygiene and low-friction properties that makeit invaluable for certain sealing applications in the food,pharmaceutical, bioprocessing and chemical processingsectors.

Media compatibility: Resistant to practically every known

chemical and solvent. Only molten alkali metals, fluorine andsome fluorine compounds at elevated temperatures/pressureswill attack it.

Seal construction: Solid PTFE, precision-machined to D6Walkersele profile. Suits housings fitted with retaining plates.

Maximum under-lip temperature: Will vary according tooperational parameters. Please consult our Technical SupportTeam.

Maximum surface speed: Will vary according to operationalparameters. Please consult our Technical Support Team.


9/369To order or get further details, call your local contact shown on rear cover or listed at www.jameswalker.biz 9

Walkersele® high-performance materials

Ultraglide — hydrogenated nitrile (HNBR)

A reformulated HNBR material with optimised properties thatgreatly extend the working life of Walkerseles running for longperiods under hot and abrasive conditions.

Walkersele® Ultraglide is theresult of a five-year researchprogramme by JamesWalker. In field trials on theintermediate stand of a hotrolling mill a WalkerseleUltraglide has given six timesthe maintenance-free life of atraditional nitrile (NBR) seal.

Special features• Far greater abrasion resistance for highly extended sealing life.• Low coefficient of fiction for improved running at higher speeds.• Better heat dissipation to keep the lip cooler for high

efficiency sealing.• Broad media capability to operate with a wide range of fluids.• Available as Endless and OSJ-2, but not as split-type seals.

Media compatibility: Excellent resistance to all lubricating oils,fuels, air, hot and cold water, dilute acids and alkalis.

Seal construction: Flexible back of HNBR-proofed aramid/glass fabric; lip of Ultraglide HNBR. Suits housings fitted withretaining plates.

Maximum under-lip temperature: 150° (302°F) constant, and170°C (338°F) in oil.

Maximum surface speed: up to 30m/s (5906fpm) in D6 design.

Typical applications: Transmission systems, gearboxes and

rotary plant in metallurgical industries, power generatingindustry, cement works, mining and quarrying, rail tractionsystems, etc. Suitable for use with ceramic shafts.

Ultraglide test results: in comparison with two other materials.

NBR FKMUltraglide

HNBR

Tensile strength (MPa) 14 12 14

Max working temperature in air (°C) 100 200 150

Coefficient of dynamic friction(BS903 pt A61) 0.42 0.40 0.20

Thermal conductivity (W/m.K) 0.28 0.25 0.45

Abrasion resistance:

Taber abrader H22 (volume loss, ml) 0.33 0.23 0.10

These show that our Ultraglide grade HNBR matches thestrength of FKM and NBR, and provides far lower friction plusvastly superior thermal conductivity and abrasion resistance.

Aflas® — tetrafluoroethylene/propylene(FEPM)

The combination of Walkersele® and Aflas® provides long-term protection for bearings that operate in highly aggressivechemical environments with steam — as well as in its originalrole for nuclear applications.

Walkersele Aflas has beenre-developed by JamesWalker in liaison with amajor manufacturer of pulpand paper plant. It solvesthe problem of bearingprotection on dewateringpresses (pulp washers) usedin chemical pulping lines.

Special featuresWalkersele Aflas uses James Walker’s high-performance Aflas-based AF90/LS compound that provides:• Wide chemical compatibility.• Excellent heat resistance.• Continuous service capability with many aggressive media.• Best radiation resistance of all elastomers on nuclear duties.

Media compatibility: Excellent resistance to the aggressivebleaching agents (particularly chlorine-free types) and hightemperature water/steam used in pulping lines. Also strongacids, oils, lubricants and some fuels, weathering and ozone.

Seal construction: Rigid back of fibre-reinforced Aflas, withflexible Aflas sealing lip. A modified Walkersele D1 design isused for pulping lines — this features:• Un-chamfered lip to prevent build-up of abrasive pulp materials.• Ports and grooves to provide good inter-seal lubrication.

Walkersele Aflas is also manufactured in D6 and D7 designs forduties beyond chemical pulping lines. All designs suit housingsfitted with retaining plates.

Typical applications: Chemical pulping lines and otherprocesses where the combination of aggressive bleachingagents plus high temperature water and steam produce anenvironment where other elastomers cannot survive for long.Note: In this environment, seals moulded in standard nitrile(NBR), hydrogenated nitrile (HNBR) or fluoroelastomer (FKM)

suffer an unacceptable level of elastomer volume swell caused by chemical and physical interactions.

Moulding capability: Aflas compounds are usually restricted to

highly specialised duties as they are exceptionally challengingto mould accurately in complex sections for rotary seals. Wehave overcome these problems. Years of process engineeringrefinement with Aflas compounds have enabled us to perfect aunique moulding technique for Walkersele Aflas production —without the addition of other polymers to aid processing.

These two highly-developed Walkersele® materials offer exceptional benefits to specific sectors of industry. We recommend thatyou discuss all applications with our Technical Support Team to determine material suitability.


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Walkersele® designs

Walkersele® designs evolve constantly to meet the needs ofmodern rotary plant working in fast moving industrial andmarine environments.

James Walker Technology Centre works at the frontiers of:• Sealing technology.• Materials technology.• Tribology.• Hydraulic fluid film theory.

Its aim is to ensure that Walkersele products are ready to meetthe exacting demands of tomorrow’s plant and equipment

before they arise.

Spring energised lipsMost Walkersele designs use a toroidal spring that lightlyenergises the flexible lip to ensure efficient sealing.

Walkerseles differ from many other manufacturers’ lip sealsin that they usually have no exposed metal componentsapart from the stainless steel spring. However, by using ourSpringSafe feature (page 17) even the toroidal spring can besafely cured into the lip-groove in our most popular designs.

Housing types — Retained and Self-retaining

Most Walkersele designs are manufactured in two versions:

Retained: These have an elastomer-proofed fabric back for installationin housings fitted with retainingplates. The lip and back sectionsare moulded together duringmanufacture to form a high strengthintimate bond.

Retained seals are supplied endless,or as split-types for ease of fitting.

Our patented Walkersele® OSJ-2 technique (pages 14-15) provides the ease of fitting of split-types combined with the

sealing integrity of endless types.

Self-retaining: These have asolid back of the same mouldedelastomer material as the lip. Aflexible steel band is incorporated inthe solid elastomer back. They aresupplied only as endless types. Walkerseles of this constructioncan be installed in open housingswithout retaining plates. (The

exception is our D7 design that operates under pressure and requires heel support when fitted facing inboard to seal an

internal pressure media.)

For full housing details on Walkerseles, see pages 25-26.

Walkersele® D6 — our most populardesign

This is the standard Walkersele® design. It is suitable for avast majority of bearing protection and other radial lip sealapplications across all sectors of industry.

Special features• Lip profile minimises heat generation and shaft wear.• Geometry gives lip flexibility to accommodate shaft

eccentricity.• Fabric-backed (retained) versions can be supplied in split

form, and as Walkersele OSJ-2 (pages 14-15) for On-SiteJoining.

• Endless-types can be supplied with SpringSafe positivespring retention (page 17).

• Works at up to 0.2bar (3psi) pressure differential, or up to 2bar(29psi) with support ring (page 30).

D6 availability — standard ranges JW Charts 56 and 57 (pages 20-21) cover standard ranges ofour M1/D6 fabric-backed (retained) version in inch and metricsizes respectively. These seals can be supplied in either endlessor spilt form — note the different order numbers on charts.

JW Charts 104 and 105 (pages 22-23) cover self-retainingM6/D6 seals in inch and metric sizes respectively.

JW Chart 376 (pages 23-24) covers self-retaining M6/D6/Mseals conforming to DIN3760 and the equivalent (BS) ISO 6194standard, as previously covered by BS1399.

D6 availability — non-standard sizesExisting tools — we have thousands of Walkersele moulds,including a vast number for non-standard sizes. If the D6 sizeyou want is not on the JW Charts, please contact us to checkmould availability. If we have a suitable tool, your seal can besupplied on short delivery time without tooling charges.

Specials — new tools are swiftly made in-house for non-standardsizes. In these cases a tooling charge will be applied. Seals forshaft diameters from 25mm to 2200mm (1 inch to 87 inch) are

produced by conventional moulding methods. Sizes above this,and up to unlimited diameter, are manufactured using our highlydeveloped vulcanised mould joining technique.




Walkersele® D7 — pressure resistant lipseal

This is our second most popular design. Its robust profilesuits pressure applications such as ships’ stabilisers and bowthrusters as well as process plant.

Special features• Works at up to 4bar (58psi) pressure differential. To achieve

this the heel of the seal lip must always be supported.• No costly profiled lip-support plates are needed.• Flexible and robust lip maintains sealing contact on

misaligned or eccentric shafts.• Self-retaining seals can be used with open housings when

sealing external fluids — but retaining plate is needed to

support heel of seal lip when seal is fitted facing inboard.• Fabric-backed (retained) version can be supplied as Walkersele® OSJ-2 (pages 14-15) for On-Site Joining. • Endless-types can be supplied with SpringSafe positive

spring retention (page 17).

D7 availabilityExisting tools — our tool library covers all popular D7 sizesand many non-standards. Please contact us to check mouldavailability. Where we have a suitable tool, your seal will besupplied on short delivery time without tooling charges.

Specials — new tools are swiftly made in-house for non-

standard sizes. In these cases a tooling charge will beapplied. Seals for shaft diameters from 30mm to 2200mm(1.2 inch to 87 inch) are produced by conventional mouldingmethods. Sizes above this, and up to unlimited diameter, aremanufactured using our highly developed vulcanised mould

joining technique.

Walkersele® D1 — original design

A non-chamfered lip design, given a new lease of life withWalkersele Aflas® for chemical pulping lines in the pulp andpaper industry, where its square leading edge prevents fibreingress.

Special features• Aflas version, with ports and grooves, provides long-term

protection for bearings of dewatering presses at pulp works(see page 9).

• Fabric-backed (retained) version can be supplied as split-type or Walkersele® OSJ-2 (pages 14-15) for On-Site Joining.

D1 availabilityExisting tools — we hold many tools for this original standarddesign, plus specific sizes for the modified Walkersele Aflasversion. Please contact us to check mould availability. Wherewe have a suitable tool, your seal will be supplied on shortdelivery time without tooling charge.

Specials — new tools are swiftly made in-house for non-standard sizes. In these cases a tooling charge will beapplied. Seals for shaft diameters from 25mm to 2200mm(1 inch to 87 inch) are produced by conventional mouldingmethods. Sizes above this, and up to unlimited diameter, aremanufactured using our highly developed vulcanised mould

joining technique.


12/36



Walkersele® D5 — compact design

A radial lip seal design for very small sections.

Special features• Very compact design, often used in endless form.• Feathered lip needs no lip spring for operation.• Seal can be used where space limitations prevent installation

of a lip spring.• Can be supplied with external lip for duties where sealing on

inner periphery is impractical.

Walkersele D5 availabilityExisting tools — we hold a number of tools for this design inboth lip modes. Please contact us to check mould availability.

Where we have a suitable tool, your seal will be supplied onshort delivery time without tooling charges.

Specials — new tools are swiftly made in-house. In thesecases a tooling charge will be applied.

Walkersele® D4 — slow rotary duties

An early design of Walkersele® that proves very efficient onslow rotary duties with highly abrasive media.

Special features• Moulded entirely in elastomer-proofed fabric for abrasion

resistance.• Suitable only for slow rotary duties with minimal shaft

eccentricity. Pulverising mills are a typical application.

Walkersele D4 availabilityThis seal has been largely superseded by Walkersele® TBMS.However, we still hold mould tools to satisfy the requirementsof existing users and applications. Please contact us to check

mould availability. Where we have a suitable tool, your seal willbe supplied on short delivery time without tooling charges.

Walkersele® TBMS — tunnel boringmachine seal

Proven on many major projects, including Channel Tunnel(7.8m/25.6ft diameter) and Airport Link Railway, Sydney(11m/36ft diameter).

Special features• Exceedingly robust radial lip seal to work for the life of a

tunnelling project.• Manufactured from tough, abrasion-resistant elastomer-

proofed fabric.• Banks of seals are installed to protect the bearings of a TBM’s

cutting head from water, slurries, abrasive material, etc.• Works at constant 3bar (43.5psi) pressure differential with

emergency excursions to 4bar (58psi). Maximum staticpressure is 10bar (145psi).

• Maximum shaft speed is 2m/s (394fpm).

Walkersele® TBMS availabilityWe hold a number of standard section continuous mouldtools for the production of large diameter TBMS endless seals.

As tunnel boring machines are usually custom-built for eachtunnelling project, please contact our Technical Support Team

at concept design stage to discuss sealing requirementsin detail.



Customised designs

Custom design in action

The design of customer-specific seals is a James Walkerspeciality. We constantly develop, prototype and provemany new lip seals in partnership with major equipmentmanufacturers and end users to solve their fluid sealingproblems. This is a service that only a few fluid seal companiescan provide.

We cover the subject here in general terms only because mostof our work at this level involves confidentiality agreements.

Our custom design operation is led by the James WalkerTechnology Centre that combines Materials, Application andField Engineering Teams.

Staffed with highly experienced engineers, materialstechnologists and chemists, this group has the proven abilityand technical facilities to study clients’ fluid sealing problemsand create the best value working solutions.

The main benefits offered by James Walker include• Innovative design capability.• Extremely comprehensive range of high performance

elastomers and other materials.• Fullest knowledge of seal and elastomer manufacturing

technologies.

These skills are backed by many years’ experience of work-

ing closely with engineers across all sectors of industry, and a

fundamental understanding of all types of equipment that need

fluid sealing components.

The group can also use non-linear FEA (finite elementanalysis) techniques for modelling its seal designs and fine-

tuning different aspects, such as lip geometry and materialsspecification, to obtain the required performance.

These developments then move to prototypes that are fully

tested on a suite of static and dynamic test rigs to simulate

closely the true operating conditions. Only when both James

Walker Technology Centre and our client are fully satisfied with

test rig results will the new seal be subjected to field trials on a

working plant.

Successes on high-profile development projects produce

very positive feed back. The resulting improvements achieved

in seal performance — in terms of operational life, sealing

integrity, and the ability to work under extreme conditions

— are greatly appreciated by James Walker’s customers on a

worldwide basis.


14/36

Walkersele® OSJ is our patented and highly successfultechnique for the On-Site Joining of split-type Walkerseles. Itsmany benefits include:

• High performance — installed units provide the sealingperformance of high-integrity endless Walkerseles.

• Worldwide proven — on marine propulsion systems,gearboxes, power stations, sugar refineries, etc…

• Cost effective maintenance — the performance and

integrity of an endless-type seal is achieved: without major plant strip-down without expensive on-site vulcanising.

Walkersele® OSJ — background tosuccess

Innumerable improvements in Walkersele® materials anddesign have been introduced over the past 50 years.

One of these was the split-type seal that proved invaluable

where gland and shaft assemblies had to be dismantled to fita moulded endless seal. This development drastically cut thecosts of plant downtime and maintenance man-hours.

However, normal split seals are not penalty-free, as sealingperformance can be affected when shaft dynamics are severe.

Abutting the ends is still a viable option if a small degree ofleakage is acceptable.

On-site vulcanising was, for many years, the only answer tosplit seal assemblies where leakage was unacceptable. Butthis process could prove expensive, as it needed a high degreeof skill and elaborate jigs. So, we developed Walkersele OSJ.

Since the introduction of Walkersele OSJ in 1991, rotary lipseal replacement has come full circle, to form a full circleagain. After a few hours’ hands-on training, a maintenancefitter is able to produce a securely bonded join that providesWalkersele with the integrity of a fully moulded endless seal.Fitting procedure is straightforward, as shown alongside.

Walkersele® OSJ-2 for On-Site Joining


Why Walkersele® OSJ-2?

This is the original proven Walkersele OSJ system, suppliedwith a modified fitting kit that makes it easier to install.

In consultation with long-term OSJ® customers, we havemodified the installation kit to make it easier and more efficientto use under arduous maintenance conditions and at largerseal diameters.

With Walkersele OSJ-2 you get exactly the same top-quality lipseal and high technology joining system as with our originalWalkersele OSJ system. The improvements include:• New user-friendly clamping band with finer tension control.• Redesigned jig to provide a more positive location of seal join.• Improved temperature indicator.• Availability in larger diameters.

Fitting procedure

Stage1: Apply epoxy adhesive to joining faces ofWalkersele® OSJ-2.

Stage 2: Align join in moulded jig.

Stage 3: Clamp into position with steel band.

Stage 4: Cure epoxy adhesive with hot air gun.


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OSJ-2 On-Site Joining kit

Kit components• Walkersele® — specially adapted at join interface for

OSJ® installation.• Steel clamping band.• Nut driver to adjust clamping band.• Joining jig — precision moulded in synthetic elastomer.• Two-part epoxy adhesive in sachet (adhesive cures to

semi-rigid state).• Adhesive applicator brush.• Degreasing cloth.• Abrasive stick.• Emery paper with self-adhesive backing.• Temperature indicator with self-adhesive backing (Note: hot

air gun is needed to affect adhesive cure).• Step-by-step instructions.

Training

Successful application of the Walkersele® OSJ technique relieson careful adherence to all stages of the joining process — aslaid down in the full instructions supplied with each kit.

We recommend that first-time users attend one of our hands-on

training sessions. These can be carried out at your premises orone of our sites.

For details, please contact our Technical Support Team or yourlocal James Walker distributor.

Walkersele® OSJ-2


Seal availability

ProfilesWalkersele® OSJ-2 is supplied in all Walkersele designs thatincorporate seal backs moulded from rubberised fabric. Therelevant profiles are:

In addition, some TBMS (tunnel boring machine seal) profilesmay be suitable for On-Site Joining.

MaterialsWalkersele OSJ-2 is supplied in the following elastomergrades: nitrile (NBR), fluorocarbon (FKM), hydrogenated

nitrile (HNBR), and Ultraglide. These relate in particular to ourWalkersele materials M1, M9, Elast-O-Lion® 180, Elast-O-Lion/KC300, and Ultraglide K (see pages 7-9).

Temperature limitThis is dependent on the seal material. It should also be notedthat the bonding technique imposes an upper limit of 150°C(302°F) on the seal.

SizesWalkersele OSJ-2 kits are readily supplied for shaft sizes from60mm to 2000mm (2.4 inch - 78.75 inch). When consideringdiameters outside this range, please contact our TechnicalSupport Team for advice.

Performance envelopeIf you need further guidance or performance data, pleasediscuss exact details of media compatibility, pressure, temperatureand surface speeds with our Technical Support Team.

D6

D6/DL

D1/DL

D7

D5

D1


16/36

Special arrangements for worn shafts


We offer a package of solutions to the problem of shaft wearcreated beneath the lip position when standard radial lip sealshave run under arduous conditions for long periods.

Walkersele® Cartridges

• One or more Walkerseles housed in a custom-designedcartridge allows the seal lip to be located away from areas ofshaft wear.

• A split-type cartridge that simply bolts on to the existing

equipment face will extend the life of the equipment withoutthe need for major strip-down, shaft reconditioning orreplacement.

• Walkersele® cartridges are also custom designed to overcomeother problems, including bearing protection for pumpshanding highly abrasive media, eccentric shaft action, and long-term sealing with minimised downtime for seal refurbishment.

Single seal & spacerSpacer ring enablesthe Walkersele lip tobe repositioned toavoid shaft wear or

damage. This cartridgearrangement showscommon bolting for sealand cartridge. Separatebolting is available.

Double sealarrangementsThese use twoWalkerseles in acartridge, alongwith variousspacers and/ordifferent widths

of lantern ring. By varying the sizes and positions of thesecomponents, the sealing elements are accurately positioned torun on specific areas of the shaft.

Floating cartridgeThis arrangementallows the sealingelements to follow theeccentric movementof worn or misalignedshafts. It is usuallyapplied to largediameter shafts thatrotate slowly.

Walkersele® Cartridge availabilitySupplied as complete customised package following an on-siteassessment of your application. Installation and refurbishmentservices are also available. Please contact our TechnicalSupport Team.

Spacer rings

These allow a Walkersele®, or combination of seals, to berelocated within a housing so that the lip/s bear on a different

area of shaft surface.

When fitted in new equipment, a spacer ring allows sealing lippositions to be readily altered when shaft wear has occurredafter a long period of operation. When retrofitting to an existingapplication, it may be necessary to modify the housing andretaining plate to accommodate the spacer ring/s.

With two (or more) Walkersele D7 seals in a housing, spacerrings must be installed between the seals to support the heelof the seal. This applies equally to seals in series — facing in orfacing out — and in back-to-back formation.

Spacer ring availability

Rings are supplied to order to suit specific Walkersele/housingconfigurations. They are available in various materials, withnylon or stainless steel proving most popular. Please contactour Technical Support Team for recommendations.

Walkersele® Shaft Sleeves

Our sleeves will protect your shaft from wear and present theoptimum running surface for Walkersele® radial lip seals. Wecan provide them in either endless or split form.

The sleeves are precision

manufactured in corrosion-resistantsteel or non-ferrous alloys, to suitthe operating conditions, and canbe supplied with hard surfacelayers when required.

Our split-type sleeves feature ataper-wedge location and lockingsystem that ensures perfectalignment of the split halves.

Shaft sleeve availabilityCustom-designed andmanufactured to suit each specific

application. Please contact ourTechnical Support Team.


17/36


18/36

Special features


Walkersele® Shallowback designs

These modified versions of Walkersele® D6 and D7 designshave reduced depth at the back, plus flexible, extended lips.

Walkersele® D6 Shallowback

Special features• Suitable for duties where housing depth limitations preclude

the use of standard Walkerseles.• Can be moulded with the extended lip and standard back for

duties where shaft eccentricity is high (Please consult ourTechnical Support Team).

• Shallowback with the extended lip is available for use withangular shaft displacement on spherical bearings/couplings.

• D7 Shallowback is used as a wiper (eg, on automatic gaugecontrol units) where it prevent the ingress of foreign matter.

D6 & D7 Shallowback availabilityExisting tools — we hold a limited number of tools for thesedesigns. Please contact us to check mould availability. Wherewe have a suitable tool, your seal will be supplied on shortdelivery time without tooling charges.

New tools — are swiftly made in-house when the size youneed does not exist. In these cases a tooling charge will beapplied.

Walkersele® Long Lip

This modified version of our D6 design incorporates a long lipfor sealing applications that involve slow rotary shafts sufferinga high degree of eccentricity, or where clearances between theshaft and housing are excessive.

Walkersele® Long LipavailabilityExisting tools — we hold alimited number of tools for thisdesign. Please contact us tocheck availability. Where wehave a suitable tool, your sealwill be supplied on shortdelivery time without toolingcharges.

New tools — are swiftly made in-house when the size youneed does not exist. In these cases a tooling charge will beapplied.

Walkersele® with ports & grooves

There are many sealing arrangements where two seals arefitted back-to-back in the same housing — eg, rolling millbearings — and it is possible that one or both will run dryunless lubricant is supplied from an external source.

This can be accomplished by introducing a lubricant flowthrough the chock to the junction of the two Walkerseles. UsingWalkerseles that are specially manufactured with an annulargroove and radial ports in their backs allows the lubricant todistribute to the lips of both seals.

Alternative methods are tomachine an annular groove inthe housing and use Walkerselesthat are manufactured with radialports, or to install a lantern ringbetween the seals — albeitthis may increase the depth ofhousing required.

Annular grooves can be provided in Walkerseles of 12.5mm(0.5 inch) section width or greater. Axial ports can be providedon any size of Walkersele.

Walkersele® with ports and grooves


19/36

Special features


Endless-type Walkerseles

All Walkerseles are available in endless form, as a completering. However, self-retaining types (ie, M6 and M8 materials) foruse in open housings are supplied only in endless form as theyhave a flexible metal band encapsulated in the back.

The main benefit of endless seals is their high integrity sealingcapability. But this is often mitigated by the maintenance

downtime required for their installation, especially on shaftbearings where the shaft may need to be removed for access. Hence the development of split-type seals and our patentedWalkersele OSJ-2 On-Site Joining technique (pages 14-15).

Split-type Walkerseles

Walkerseles with a flexible back of elastomer-proofed fabric(excluding D7 design) can be provided as split-types for easeof installation. These include M1, M5, M9, and Elast-O-Lion® 180 & Elast-O-Lion/KC300 material types. Aflas® grades can

also be supplied split, but their special benefits with abrasive orchemically aggressive media may be compromised.

A split-type Walkersele is manufactured with a solid elastomerinsert where the split is formed. This gives a rubber-to-rubbermating face in the seal’s body for close and accurate abutmentwhen the seal is in position. Installation is simple, as the seal iseasily opened out around the shaft, the ends mated, and thetoroidal lip-energising spring screwed together.

However, the sealing performance of split type seals can beaffected when shaft dynamics are severe, and a small degreeof leakage past the abutted ends is always possible.

Our patented Walkersele OSJ-2 On-Site Joining technique

overcomes these problems (pages 14-15).


Hydropower turbine

Turbine shaft seals on an EDF hydroelectric scheme atVilleneuve, France, have been converted to Walkerseleusing James Walker’s patented OSJ® On-Site Joiningtechnique.

Three Walkersele D7 seals running on a tungstencarbide coated shaft sleeve were fitted in less than

three hours.The original sealing system on the 13MW bulb

type turbine proveddifficult to keep in

good condition in the highly abrasive andcorrosive river flow.The Walkerseles last

significantly longer, seal more efficiently and are far easier to maintain.


Wind turbines

Wind power technology company NEG Micon ofDenmark uses 1800mmdiameter Walkerselesto protect the slew ring

mechanism that keepsthe head of its 900kWturbines facing intowind. A special Walkersele® was custom designed

and moulded with anextra dust lip for this

application.


20/36

Walkersele® M1/D6 standard range


Walkersele® M1/D6

JW Charts 56 and 57, as shown on these two pages, containour standard ranges of Walkersele® M1/D6 seals for use inhousings with retaining plates.

• Chart 56 covers inch size seals.• Chart 57 covers metric sizes.

All these seals are available ex-stock.

When ordering, please quote the appropriate JW Order Code,which differentiates between endless-type and split-type seals.

JW Chart 56: Walkersele® M1/D6 — inch sizes

ShaftDiaA

HousingDiaB

HousingDepth

CJW Part No.

JWOrder CodeENDLESS

JWOrder Code

SPLIT

1 1⁷⁄₈ ³⁄₈ 56-100 WG-000259 WG-010254

1¹⁄₈ 2 ³⁄₈ 56-112 WG-000283 WG-010289

1¹⁄₄ 2¹⁄₈ ³⁄₈ 56-125 WG-000313 WG-010319

1³⁄₈ 2¹⁄₄ ³⁄₈ 56-137 WG-000348 WG-010343

1¹⁄₂ 2¹⁄₂ ⁷⁄₁₆ 56-150 WG-000380 WG-010386

1⁵⁄₈ 2⁵⁄₈ ⁷⁄₁₆ 56-162 WG-000410 WG-0104161³⁄₄ 2³⁄₄ ⁷⁄₁₆ 56-175 WG-000445 WG-010440

1⁷⁄₈ 2⁷⁄₈ ⁷⁄₁₆ 56-187 WG-00047X WG-010475

2 3 ⁷⁄₁₆ 56-200 WG-00050X WG-010505

2¹⁄₈ 3¹⁄₈ ⁷⁄₁₆ 56-212 WG-000534 WG-01053X

2¹⁄₄ 3¹⁄₄ ⁷⁄₁₆ 56-225 WG-000577 WG-010572

2³⁄₈ 3³⁄₈ ⁷⁄₁₆ 56-237 WG-000607 WG-010602

2¹⁄₂ 3¹⁄₂ ⁷⁄₁₆ 56-250 WG-000631 WG-010637

2³⁄₄ 4 ¹⁄₂ 56-275 WG-000690 WG-010696

3 4¹⁄₄ ¹⁄₂ 56-300 WG-000763 WG-010769

3¹⁄₄ 4¹⁄₂ ¹⁄₂ 56-325 WG-000828 WG-010823

3¹⁄₂ 4³⁄₄ ¹⁄₂ 56-350 WG-000887 WG-010882

3³⁄₄ 5 ¹⁄₂ 56-375 WG-00095X WG-010955

4 5¹⁄₄ ¹⁄₂ 56-400 WG-001018 WG-0110134¹⁄₄ 5³⁄₄ ⁵⁄₈ 56-425 WG-001077 WG-011072

4¹⁄₂ 6 ⁵⁄₈ 56-450 WG-00114X WG-011145

4³⁄₄ 6¹⁄₄ ⁵⁄₈ 56-475 WG-001204 WG-01120X

5 6¹⁄₂ ⁵⁄₈ 56-500 WG-001271 WG-011277

5¹⁄₄ 6³⁄₄ ⁵⁄₈ 56-525 WG-001336 WG-011331

5¹⁄₂ 7 ⁵⁄₈ 56-550 WG-001395 WG-011390

5³⁄₄ 7¹⁄₄ ⁵⁄₈ 56-575 WG-001468 WG-011463

6 7¹⁄₂ ⁵⁄₈ 56-600 WG-001522 WG-011528

6¹⁄₄ 7³⁄₄ ⁵⁄₈ 56-625 WG-001581 WG-011587

6¹⁄₂ 8 ⁵⁄₈ 56-650 WG-001654 WG-01165X

6³⁄₄ 8¹⁄₄ ⁵⁄₈ 56-675 WG-001719 WG-011714

7 8¹⁄₂ ⁵⁄₈ 56-700 WG-001778 WG-011773

7¹⁄₂ 9 ⁵⁄₈ 56-750 WG-001905 WG-0119008 9¹⁄₂ ⁵⁄₈ 56-800 WG-002030 WG-012036

8¹⁄₂ 10 ⁵⁄₈ 56-850 WG-002154 WG-01215X

9 10¹⁄₂ ⁵⁄₈ 56-900 WG-002286 WG-012281

9¹⁄₂ 11 ⁵⁄₈ 56-950 WG-002413 WG-012419

10 11¹⁄₂ ⁵⁄₈ 56-1000 WG-002545 WG-012540

10¹⁄₂ 12¹⁄₄ ³⁄₄ 56-1050 WG-002669 WG-012664

11 12³⁄₄ ³⁄₄ 56-1100 WG-002790 WG-012796

11¹⁄₂ 13¹⁄₄ ³⁄₄ 56-1150 WG-002928 WG-012923

12 13³⁄₄ ³⁄₄ 56-1200 WG-003045 WG-013040

13 14³⁄₄ ³⁄₄ 56-1300 WG-003304 WG-01330X

14 15³⁄₄ ³⁄₄ 56-1400 WG-00355X WG-013555

15 16³⁄₄ ³⁄₄ 56-1500 WG-003819 WG-013814

All dimensions in inches


21/36



JW Chart 57:

Walkersele® M1/D6 — metric sizes

JW Chart 57:

Walkersele® M1/D6 — metric sizes (continued)

ShaftDiaA

HousingDiaB

HousingDepth

CJW Part No.

JWOrder CodeENDLESS

JWOrder Code

SPLIT

25 47 10 57-25 WG-02025X WG-030255

30 52 10 57-30 WG-020306 WG-030301

32 54 10 57-32 WG-020322 WG-030328

35 57 10 57-35 WG-020357 WG-030352

38 63 11 57-38 WG-020381 WG-030387

40 65 11 57-40 WG-020403 WG-03040942 67 11 57-42 WG-02042X WG-030425

43 68 11 57-43 WG-020438 WG-030433

45 70 11 57-45 WG-020454 WG-03045X

50 75 11 57-50 WG-020500 WG-030506

53 78 11 57-53 WG-020535 WG-030530

55 80 11 57-55 WG-020551 WG-030557

58 83 11 57-58 WG-020586 WG-030581

60 85 11 57-60 WG-020608 WG-030603

65 90 11 57-65 WG-020659 WG-030654

68 100 12.5 57-68 WG-020683 WG-030689

70 102 12.5 57-70 WG-020705 WG-030700

73 105 12.5 57-73 WG-02073X WG-030735

75 107 12.5 57-75 WG-020756 WG-030751

80 112 12.5 57-80 WG-020802 WG-03080882 114 12.5 57-82 WG-020829 WG-030824

85 117 12.5 57-85 WG-020853 WG-030859

88 120 12.5 57-88 WG-020888 WG-030883

90 122 12.5 57-90 WG-02090X WG-030905

93 125 12.5 57-93 WG-020934 WG-03093X

95 127 12.5 57-95 WG-020950 WG-030956

97 129 12.5 57-97 WG-020977 WG-030972

100 132 12.5 57-100 WG-021000 WG-031006

105 145 16 57-105 WG-021051 WG-031057

110 150 16 57-110 WG-021108 WG-031103

115 155 16 57-115 WG-021159 WG-031154

120 160 16 57-120 WG-021205 WG-031200

125 165 16 57-125 WG-021256 WG-031251

130 170 16 57-130 WG-021302 WG-031308135 175 16 57-135 WG-021353 WG-031359

140 180 16 57-140 WG-02140X WG-031405

145 185 16 57-145 WG-021450 WG-031456

150 190 16 57-150 WG-021507 WG-031502

155 195 16 57-155 WG-021558 WG-031553

160 200 16 57-160 WG-021604 WG-03160X

165 205 16 57-165 WG-021655 WG-031650

166 206 16 57-166 WG-021663 WG-031669

170 210 16 57-170 WG-021701 WG-031707

175 215 16 57-175 WG-021752 WG-031758

180 220 16 57-180 WG-021809 WG-031804

185 225 16 57-185 WG-02185X WG-031855

190 230 16 57-190 WG-021906 WG-031901

195 235 16 57-195 WG-021957 WG-031952200 240 16 57-200 WG-022007 WG-032002

205 245 16 57-205 WG-022058 WG-032053

210 250 16 57-210 WG-022104 WG-03210X

215 255 16 57-215 WG-022155 WG-032150

220 260 16 57-220 WG-022201 WG-032207

ShaftDiaA

HousingDiaB

HousingDepth

CJW Part No.

JWOrder CodeENDLESS

JWOrder Code

SPLIT

225 265 16 57-225 WG-022252 WG-032258

230 270 16 57-230 WG-022309 WG-032304

235 275 16 57-235 WG-02235X WG-032355

240 280 16 57-240 WG-022406 WG-032401

245 285 16 57-245 WG-022457 WG-032452

250 290 16 57-250 WG-022503 WG-032509

255 299 20 57-255 WG-022554 WG-03255X

260 304 20 57-260 WG-022600 WG-032606

265 309 20 57-265 WG-022651 WG-032657

270 314 20 57-270 WG-022708 WG-032703

275 319 20 57-275 WG-022759 WG-032754

280 324 20 57-280 WG-022805 WG-032800

285 329 20 57-285 WG-022856 WG-032851

290 334 20 57-290 WG-022902 WG-032908

295 339 20 57-295 WG-022953 WG-032959

296 340 20 57-296 WG-022961 WG-032967

300 344 20 57-300 WG-023003 WG-033009

305 349 20 57-305 WG-023054 WG-03305X

310 354 20 57-310 WG-023100 WG-033106

320 364 20 57-320 WG-023208 WG-033203

325 369 20 57-325 WG-023259 WG-033254330 374 20 57-330 WG-023305 WG-033300

340 384 20 57-340 WG-023402 WG-033408

350 394 20 57-350 WG-02350X WG-033505

360 404 20 57-360 WG-023607 WG-033602

370 414 20 57-370 WG-023704 WG-03370X

380 424 20 57-380 WG-023801 WG-033807

390 434 20 57-390 WG-023909 WG-033904

400 444 20 57-400 WG-02400X WG-034005

413 463 22 57-413 WG-024131 WG-034137

420 470 22 57-420 WG-024204 WG-03420X

430 480 22 57-430 WG-024301 WG-034307

440 490 22 57-440 WG-024409 WG-034404

450 500 22 57-450 WG-024506 WG-034501

455 505 22 57-455 WG-024557 WG-034552

460 510 22 57-460 WG-024603 WG-034609475 525 22 57-475 WG-024751 WG-034757

480 530 22 57-480 WG-024808 WG-034803

485 535 22 57-485 WG-024859 WG-034854

500 550 22 57-500 WG-025006 WG-035001

530 580 22 57-530 WG-025308 WG-035303

540 590 22 57-540 WG-025405 WG-035400

560 610 22 57-560 WG-02560X WG-035605

580 630 22 57-580 WG-025804 WG-03580X

600 650 22 57-600 WG-026002 WG-036008

650 714 25 57-650 WG-026509 WG-036504

660 724 25 57-660 WG-026606 WG-036601

700 764 25 57-700 WG-027009 WG-037004

750 814 25 57-750 WG-027505 WG-037500

790 854 25 57-790 WG-027904 WG-03790X

800 864 25 57-800 WG-028005 WG-038000820 884 25 57-820 WG-02820X WG-038205

830 894 25 57-830 WG-028307 WG-038302

970 1034 25 57-970 WG-029702 WG-039708

1000 1064 25 57-1000 WG-029990 WG-039996

All dimensions in mm


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Walkersele® M6/D6

JW Charts 104, 105 and 376, as shown on the followingthree pages, contain our standard ranges of self-retainingWalkersele® M6/D6 seals for use with open housings.

• Chart 104 covers inch size seals.• Chart 105 covers metric sizes.• Chart 376 covers seals conforming to the widely used

DIN3760 and the equivalent (BS) ISO 6194 standard,as previously covered by BS1399.

All these seals are available ex-stock.

When ordering, please quote the appropriate JW Order Code. As these seals are self-retaining they are supplied only asendless types.

((Housing diagram+ key))

JW Chart 104

Walkersele® M6/D6 — inch sizes

ShaftDiaA

HousingDiaB

HousingDepth

CJW Part No.

JWOrder Code

2 3 ⁷⁄₁₆ 104-200 WG-050507

2¹⁄₈ 3¹⁄₈ ⁷⁄₁₆ 104-212 WG-05054X

2¹⁄₄ 3¹⁄₄ ⁷⁄₁₆ 104-225 WG-050574

2³⁄₈ 3³⁄₈ ⁷⁄₁₆ 104-237 WG-050604

2¹⁄₂ 3¹⁄₂ ⁷⁄₁₆ 104-250 WG-050639

2³⁄₄ 4 ¹⁄₂ 104-275 WG-050701

3 4¹⁄₄ ¹⁄₂ 104-300 WG-050760

3¹⁄₄ 4¹⁄₂ ¹⁄₂ 104-325 WG-050833

3¹⁄₂ 4³⁄₄ ¹⁄₂ 104-350 WG-050892

3³⁄₄ 5 ¹⁄₂ 104-375 WG-050957

4 5¹⁄₄ ¹⁄₂ 104-400 WG-051015

4¹⁄₄ 5³⁄₄ ⁵⁄₈ 104-425 WG-051074

4¹⁄₂ 6 ⁵⁄₈ 104-450 WG-051147

4³⁄₄ 6¹⁄₄ ⁵⁄₈ 104-475 WG-051201

5 6¹⁄₂ ⁵⁄₈ 104-500 WG-051279

5¹⁄₄ 6³⁄₄ ⁵⁄₈ 104-525 WG-051333

5¹⁄₂ 7 ⁵⁄₈ 104-550 WG-051392

5³⁄₄ 7¹⁄₄ ⁵⁄₈ 104-575 WG-051465

6 7¹⁄₂ ⁵⁄₈ 104-600 WG-05152X

6¹⁄₄ 7³⁄₄ ⁵⁄₈ 104-625 WG-051589

6¹⁄₂ 8 ⁵⁄₈ 104-650 WG-051651

6³⁄₄ 8¹⁄₄ ⁵⁄₈ 104-675 WG-051716

7 8¹⁄₂ ⁵⁄₈ 104-700 WG-051775

7¹⁄₂ 9 ⁵⁄₈ 104-750 WG-051902

8 9¹⁄₂ ⁵⁄₈ 104-800 WG-052038

8¹⁄₂ 10 ⁵⁄₈ 104-850 WG-05216X

9 10¹⁄₂ ⁵⁄₈ 104-900 WG-052283

9¹⁄₂ 11 ⁵⁄₈ 104-950 WG-052410

10 11¹⁄₂ ⁵⁄₈ 104-1000 WG-052542

10¹⁄₂ 12¹⁄₄ ³⁄₄ 104-1050 WG-052666

11 12³⁄₄ ³⁄₄ 104-1100 WG-052798

11¹⁄₂ 13¹⁄₄ ³⁄₄ 104-1150 WG-05292512 13³⁄₄ ³⁄₄ 104-1200 WG-053042

13 14³⁄₄ ³⁄₄ 104-1300 WG-053301

14 15³⁄₄ ³⁄₄ 104-1400 WG-053557

15 16³⁄₄ ³⁄₄ 104-1500 WG-053816

All dimensions in inches


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JW Chart 105

Walkersele® M6/D6 — metric sizes

JW Chart 376

Walkersele® M6/D6/M — to DIN 3760/ (BS) ISO 6194-1

ShaftDiaA

HousingDiaB

HousingDepth

CJW Part No.

JWOrder Code

50 75 11 105-50 WG-060502

55 80 11 105-55 WG-060553

60 85 11 105-60 WG-06060X

65 90 11 105-65 WG-060650

70 102 12.5 105-70 WG-060707

75 107 12.5 105-75 WG-060758

80 112 12.5 105-80 WG-060804

85 117 12.5 105-85 WG-060855

90 122 12.5 105-90 WG-060901

95 127 12.5 105-95 WG-060952

100 132 12.5 105-100 WG-061002

105 145 16 105-105 WG-061053

110 150 16 105-110 WG-06110X

115 155 16 105-115 WG-061150

120 160 16 105-120 WG-061207

125 165 16 105-125 WG-061258

130 170 16 105-130 WG-061304

135 175 16 105-135 WG-061355

140 180 16 105-140 WG-061401

145 185 16 105-145 WG-061452

150 190 16 105-150 WG-061509

160 200 16 105-160 WG-061606

170 210 16 105-170 WG-061703

180 220 16 105-180 WG-061800

190 230 16 105-190 WG-061908

200 240 16 105-200 WG-062009

210 250 16 105-210 WG-062106

220 260 16 105-220 WG-062203

230 270 16 105-230 WG-062300

240 280 16 105-240 WG-062408

250 290 16 105-250 WG-062505

260 304 20 105-260 WG-062602270 314 20 105-270 WG-06270X

280 324 20 105-280 WG-062807

290 334 20 105-290 WG-062904

300 344 20 105-300 WG-063005

310 354 20 105-310 WG-063102

320 364 20 105-320 WG-06320X

330 374 20 105-330 WG-063307

340 384 20 105-340 WG-063404

350 394 20 105-350 WG-063501

360 404 20 105-360 WG-063609

370 414 20 105-370 WG-063706

380 424 20 105-380 WG-063803

390 434 20 105-390 WG-063900400 444 20 105-400 WG-064001

420 470 22 105-420 WG-064206

ShaftDiaA

HousingDiaB

HousingDepth

CJW Part No.

JWOrder Code

62 85 10 376-062085 WG-040609

62 90 10 376-062090 WG-040625

63 85 10 376-063085 WG-040633

63 90 10 376-063090 WG-040641

65 85 10 376-065085 WG-04065X

65 90 10 376-065090 WG-040668

65 100 10 376-065100 WG-040676

68 90 10 376-068090 WG-040684

68 100 10 376-068100 WG-040692

70 90 10 376-070090 WG-040706

70 95 10 376-070095 WG-040714

70 100 10 376-070100 WG-040722

72 95 10 376-072095 WG-040730

72 100 10 376-072100 WG-040749

75 95 10 376-075095 WG-040765

75 100 10 376-075100 WG-040757

78 100 10 376-078100 WG-040781

80 100 10 376-080100 WG-040803

80 110 10 376-080110 WG-040811

85 110 12 376-085110 WG-040854

85 120 12 376-085120 WG-040862

90 110 12 376-090110 WG-040889

90 120 12 376-090120 WG-040900

95 120 12 376-095120 WG-040951

95 125 12 376-095125 WG-04096X

100 120 12 376-100120 WG-040986

100 125 12 376-100125 WG-041001

100 130 12 376-100130 WG-041028

105 130 12 376-105130 WG-041052

105 140 12 376-105140 WG-041060

110 130 12 376-110130 WG-041109110 140 12 376-110140 WG-041117

115 140 12 376-115140 WG-04115X

115 150 12 376-115150 WG-041168

ShaftDiaA

HousingDiaB

HousingDepth

CJW Part No.

JWOrder Code

440 490 22 105-440 WG-064400

460 510 22 105-460 WG-064605

480 530 22 105-480 WG-06480X

500 550 22 105-500 WG-065008

All dimensions in mm (continued overleaf)

All dimensions in mm

JW Chart 105Walkersele® M6/D6 — metric sizes (continued)

***

*

***

***

*

*

*


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JW Chart 376 (continued)Walkersele® M6/D6/M — to DIN 3760/ (BS) ISO 6194-1

((Housing diagram+ key))

ShaftDiaA

HousingDiaB

HousingDepth

CJW Part No.

JWOrder Code

120 150 12 376-120150 WG-041206

120 160 12 376-120160 WG-041222

125 150 12 376-125150 WG-041249

125 160 12 376-125160 WG-041257

130 160 12 376-130160 WG-041303

130 170 12 376-130170 WG-04132X

135 170 12 376-135170 WG-041354

140 170 15 376-140170 WG-041400

145 175 15 376-145175 WG-041451

150 180 15 376-150180 WG-041508

160 190 15 376-160190 WG-041605

170 200 15 376-170200 WG-041702

180 210 15 376-180210 WG-04180X

190 220 15 376-190220 WG-041907

200 230 15 376-200230 WG-042008

210 240 15 376-210240 WG-042105

220 250 15 376-220250 WG-042202

230 260 15 376-230260 WG-04230X

240 270 15 376-240270 WG-042407

250 280 15 376-250280 WG-042504

260 300 20 376-260300 WG-042601

280 320 20 376-280320 WG-042806

300 340 20 376-300340 WG-043004

320 360 20 376-320360 WG-043209

340 380 20 376-340380 WG-043403

360 400 20 376-360400 WG-043608

380 420 20 376-380420 WG-043802

400 440 20 376-400440 WG-044000

420 460 20 376-420460 WG-044205

440 480 20 376-440480 WG-04440X

460 500 20 376-460500 WG-044604

480 520 20 376-480520 WG-044809500 540 20 376-500540 WG-045007

All dimensions in mmThese sizes no longer appear in the standards quoted.


Side thrusters repairs

Swift action by James Walker and Blohm + Voss Repairensured that the Queen Mary 2 cruise liner set sail ontime after 11 days of classification work, painting and

plant overhaul at Hamburg.

Four 220mm Walkersele M1/D7 seals were identified, precision moulded in the UK, and delivered to Hamburg in just two days to complete unscheduled work on the ship’s starboard bow thrusters.


Tunnel boring in Australia

Walkersele® TBMStunnel boring machine

seals protected thecutting face bearingsfrom sand and rock

spoil on the 11mdiameter machine thatcut 6km of the fast-track

Airport Link railwayline beneath Sydney,

Australia. James Walker

supplied the seals tothe TBM’s German

manufacturer,Herrenknecht GmbH.

*

*

*

*


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Walkersele® housings


Housing sizes — Walkersele® D6 design

For guidance purposes, our recommended housing sizes for

given shaft diameters are:

Walkersele® D6 seals with retaining plates(All materials except M6 & M8)

Shaft diameter ‘A’Nominal housing sizes

Depth ‘C’ Section ‘D’

mm inch mm inch mm inch

> ≤ > ≤

- 35 - 1³₈ 10 ³₈ 11 ⁷₁₆

35 65 1³₈ 2½ 11 ⁷₁₆ 12.5 ½

65 100 2½ 4 12.5 ½ 16 ⁵₈

100 250 4 10 16 ⁵₈ 20 ¾

250 400 10 16 20 ¾ 22 ⁷₈

400 600 16 24 22 ⁷₈ 25 1

600 - 24 - 25 1 32 1¼

Walkersele® D6 self-retaining seals(Materials M6* & M8)




> ≤ > ≤

- 65 - 2½ 10 ³₈ 10 ³₈

65 100 2½ 4 12.5 ½ 12.5 ½

100 250 4 10 15 ⁵₈ 15 ⁵₈

250 400 10 16 20 ¾ 20 ¾400 600 16 24 22 ⁷₈ 22 ⁷₈

600 900 24 35½ 25 1 25 1

*Note that M6 standard seals to charts 104, 105 and 376 willnot necessarily conform to these recommendations, so pleaseuse dimensions shown on those charts on pages 22-24.

Housing sizes — Walkersele® D7 design

For guidance purposes our recommended housing sizes forgiven shaft diameters are:

Walkersele® D7 seals with retaining plates(All materials except M6 & M8)




> ≤ > ≤

30 100 1.18 3.94 15 0.591 17.5 0.689

100 250 3.94 9.84 16 0.630 20 0.787

250 400 9.84 15.75 20 0.787 22 0.866

400 600 15.75 23.62 22 0.866 25 0.984

600 - 23.62 - 25 0.984 32 1.260

Walkersele® D7 self-retaining seals(Materials M6 & M8)




> ≤ > ≤

30 250 1.18 9.84 15 0.591 15 0.591

250 330 9.84 12.99 16 0.630 17.5 0.689

330 450 12.99 17.72 20 0.787 20 0.787

450 600 17.72 23.62 22 0.866 25 0.984

600 - 23.62 - 25 0.984 30 1.181

D6 seals with retaining plate.All materials except M6 & M8

D6 self-retaining seals.Materials M6 & M8

D7 seals with retaining plate (R).

All materials except M6 & M8

D7 self-retaining seals.

Materials M6 & M8

l ll l l

l ll

**15°

** Chamferlength

ShaftØ 'A' - h11

Housingsection 'D'

** Chamfer details typicalfor all D6 lip

designs and materials

Housing boreØ 'B' - H8

Housing boreØ 'B' - H9

Ø 'RC'

'RA'

Ø 'RB'

Housing depth 'C'

* *

:

:

- - : -

;


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Walkersele® housings


Seals with retaining plate ‘R’(ie, all materials except M6 & M8)

Housing depth ‘C’ tolerance limits

mm inch

Single seals ± 0.1 ± 0.004

Double seals+ 0.2 + 0.008

- 0 - 0

*Housing chamfers — D6 & D7 designs A chamfer should be provided at the entrance to the housingto facilitate assembly (particularly for M6 and M8 Walkerseles).Where the nominal housing depth is equal to the seal depth,the chamfer dimensions should not exceed 1mm x 30° forseals up to and including 10mm deep, or 2mm x 30° for sealsover 10mm deep (0.040 inch x 30° for seals up to and including³₈ inch deep, or 0.080 inch x 30° for seals over ³₈ inch deep).

Housing tolerances — D6 & D7 designs

Shaft housing diameter tolerances based on BS EN 20286-2, ISO 286-2. We recommend h11 be used to allow for shaft reconditioning.

Self-retaining seals(ie, materials M6 & M8)

‡ Shaft chamfers — D6 & D7 designs

‡ Shaft chamfers

mm inch

Shaft diameter ‘A’Chamfer

minimum

axial depth

Shaft diameter ‘A’Chamfer

minimum

axial depth> ≤ > ≤

3 50 8 x 15° 0.12 1.97 ⁵₁₆ x 15°

50 250 10 x 15° 1.97 9.85 ³₈ x 15°

250 800 15 x 15° 9.85 31.5 ⁹₁₆ x 15°

800 - 20 x 15° 31.5 - ¾ x 15°

Retaining plate (R) dimensions — D6 & D7 designs

Nominal shaftdiameter ‘A’

(mm)

Minimum plate thickness‘RA’

(mm)

Outsidediameter

‘RB’[minimum]

(mm)

Inside diameter‘RC’ [maximum]

(mm)Bolting requirements

> ≤Singleseals

Double seals D6 design D7 design SizeNumberof bolts

PCD(mm)

- 35 3 4.5 B + 28 A + 0.75C A + 3 M5 4 B + 13

35 65 4 6 B + 30 A + 0.75C A + 3 M5 6 B + 13

65 100 5 7.5 B + 43 A + 0.75C A + 3 M8 6 B + 20

100 250 7 10.5 B + 45 A + 0.75C A + 4 M8 8 B + 20

250 400 8 12 B + 56 A + 0.75C A + 4 M10 8 B + 24

400 600 10 15 B + 65 A + 0.75C A + 4 M12 12 B + 30

600 900 12.5 18.8 B + 76 A + 0.75C A + 5 M14 16 B + 34

900 1200 12.5 22.5 B + 76 A + 0.75C A + 5 M14 20 B + 34

Note that with Walkersele® D7 a retaining plate should cover the full base width of the seal to support the heel (necessary for resistingfluid pressures) especially when an otherwise ‘self-retaining’ seal is fitted facing outwards.


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General information

Important notice: Do not attempt to re-install a Walkersele® once it has been removed from its housing. To ensurelong-term efficient operation, always fit a new Walkersele.

1) The groove formedbetween the lip seal andback should normally facethe direction to be sealed.

2) With an endless-seal, alead-in should be providedat the ends of shafts, rollnecks, abutment rings, etc,over which the seal has topass, to avoid damaging theseal lips (see page 26).

3) Thoroughly clean the sealhousing and shaft. Wipethe seal with a clean clothto remove any dust, etc,accumulated during storage.

4) Apply a smear of lubricant to the seal lip and shaftimmediately prior to installation. (Note lubricant/chemicalcompatibilities on pages 7 to 9 for Walkersele® materials.)

5) When seal housings are detachable and in halves, werecommend that (where possible) these halves be boltedtogether before installing the seal.

6) Use the correct size retaining plates, where applicable (see page 26). Thin retaining plates should be avoided, as they tendto distort when bolted and compress the seal unevenly.

7) Jointing compounds should NOT be used on the seal. Theymay, however, be carefully and thinly applied between the

retaining plate and machine or housing face to prevent leakageunder the retaining plate — particularly if the plate is fitted on thesealed fluid side. Care must be taken to avoid contamination oringress of jointing compound into the seal area.

Endless seals (except M6 & M8)

1) Flex the seal in hands toensure an even distributionof spring tension.

2) Work the seal into thehousing by hand and press

it firmly against the bottomof the housing.

3) Apply retaining plate andbolt up evenly until it is hardagainst seal housing face.

Endless seals M6 & M8 self-retaining

1) Liberally lubricate the seal outside diameter with soapy wateror soft grease. (Note lubricant/chemical compatibilities on

pages 7 to 9 for Walkersele® materials.)

2) Enter seal into housing — to almost full depth of seal — foras much of the circumference as possible. This should leaveabout one-sixth of the seal to be manipulated.

3) Gradually work the un-entered part of seal intothe housing by inward anddownward hand pressure. Thisshould be sufficient for seals upto 450mm (18 in) diameter.

4) Above 450mm (18 in)diameter, the last portion ofthe seal should be looped so itcurves away from the housing.

5) The last portion of seal circumference is then urged towardsthe housing bore by hand pressure until it forms a circle.

6) Press or tap the seal evenly into its final axial location, andreplace the shaft.

Split seals (not applicable to M6 & M8)

1) Remove spring from seal(where applicable) andunscrew spring at the join.

2) Pass spring around shaftand, holding one end in eachhand, twist one end a few turnsas if ‘unscrewing’. Now bringspring ends together and screwup the join.

3) Flex seal ends outwardsto counteract any curl-in that has occurred during transit orstorage (Curl-in can cause leakage).

4) Pass the seal around the shaft — ensuring the lip pointsthe correct direction for sealing action required — then lift thespring into the groove in the seal lip.

5) Ensure the two seal ends mate perfectly. With split at the top,enter the seal evenly into the housing and press it firmly to thehousing bottom.

6) When two seals are fitted together, the joins should bestaggered at about 30° on each side of top dead centre.

7) Apply retaining plate and bolt up evenly until it is hardagainst the seal housing face.

Arrow indicatesdirection of sealing

Fit retaining plateand tighten evenly.

Push seal evenlyuntil housed.

Insert seal evenly intohousing with

split section first.


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28

Fitting self-retaining lip seals(eg, M6 & M8) in blind housing

1) The groove formed between

Radial Lip Seals

Documents

Transcript of Radial Lip Seals